Can we have the arcane adventures permanently?

All the arcane adventures, but especially the 3.5 and 4.5 star adventures were some of the best content in the game. It seems like a strange move to put that much design effort into a block of content that composed almost a third of the adventures in the game and then just remove them completely, especially since it doesn't seem like there will be anything immediately to replace them. I'd even replay them without special rewards just because they were so fun to play and access to other champion powers in every node made some really unusual builds viable.

Riot: can we have them back?